True that. To some extent though (Australian born Korean here).
You have to realise when you first migrate to another country; where you were once the majority population but now become part of the minority of ethnic groups within that new country, you have no choice really as a first wave migrant but to stick to what you know best and that is to live within well established cultural enclaves (Strathfield, Eastwood in the case of Koreans). Helps the person(s) to assimilate easier into Australia or wherever the place may be.
Also you must realised that Korean migration history to Australia is still relatively young whilst the Chinese have been coming over since technically speaking the 'Gold Rush' period of the 1850s-60s. Since their migration history is longer it means they've had a lot longer to settle down and assimilate into the community (learning the culture and language better) with now 4th and 5th generation Chinese Australians whilst the main bulk of Koreans living in Australia are still relatively 1st generation or '1.5' so to speak.
Though I wouldn't support just ' sticking with your own kind' for prolonged periods of time as it would be going backwards rather than forwards in terms of opportunities that the individual was seeking when migrating to this new country. Although I must say my parents or the rest of my family never really lived in these cultural hives. Just moved around all over Sydney.